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<mods:title id="9FBE5003DEC3221817AEDA69A626B544">Mexorchestia: a new genus of talitrid amphipod (Crustacea, Amphipoda, Talitridae) from the Gulf of Mexico and Caribbean Sea, with the description of a new species and two new subspecies</mods:title>
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<treatment id="03A3AA05FFB94344FF0AA9F9FAD85F4D" ID-DOI="http://doi.org/10.5281/zenodo.5613158" ID-GBIF-Taxon="119587550" ID-Zenodo-Dep="5613158" LSID="urn:lsid:plazi:treatment:03A3AA05FFB94344FF0AA9F9FAD85F4D" httpUri="http://treatment.plazi.org/id/03A3AA05FFB94344FF0AA9F9FAD85F4D" lastPageId="3" lastPageNumber="557" pageId="2" pageNumber="557">
<subSubSection id="C3104898FFB94345FF0AA9F9FDFF5E9C" box="[151,512,978,1004]" pageId="2" pageNumber="557" type="nomenclature">
<paragraph id="8BB51B13FFB94345FF0AA9F9FDFF5E9C" blockId="2.[151,512,978,1004]" box="[151,512,978,1004]" pageId="2" pageNumber="557">
<heading id="D0FDAC7FFFB94345FF0AA9F9FDFF5E9C" bold="true" box="[151,512,978,1004]" fontSize="11" level="1" pageId="2" pageNumber="557" reason="1">
<taxonomicName id="4C0A6090FFB94345FF0AA9F9FDFF5E9C" ID-CoL="7Q432" authority="Bousfield, 1984" authorityName="Bousfield" authorityYear="1984" box="[151,512,978,1004]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="557" phylum="Arthropoda" rank="genus">
<emphasis id="B97EC701FFB94345FF0AA9F9FDFF5E9C" bold="true" box="[151,512,978,1004]" pageId="2" pageNumber="557">
<emphasis id="B97EC701FFB94345FF0AA9F9FEC45E9C" bold="true" box="[151,315,978,1004]" italics="true" pageId="2" pageNumber="557">Tethorchestia</emphasis>
<bibRefCitation id="EF9B66E2FFB94345FEDCA9F9FDFF5E9C" author="Bousfield" box="[321,512,978,1004]" pageId="2" pageNumber="557" refString="Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amhpipoda: Talitridae) of the Indo-Pacific region. In: Radovsky, F. J., Raven, P. H. &amp; Somer, S. H. (Eds.), Proceedings of the Symposium on Biogeography of the Tropical Pacific. Bishop Museum Special Publications, 72, pp. 171 - 210." type="journal article" year="1984">Bousfield, 1984</bibRefCitation>
</emphasis>
</taxonomicName>
</heading>
</paragraph>
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<subSubSection id="C3104898FFB94345FF0AAE32FDA6595F" box="[151,601,1049,1071]" pageId="2" pageNumber="557" type="reference_group">
<paragraph id="8BB51B13FFB94345FF0AAE32FDA6595F" blockId="2.[151,601,1049,1071]" box="[151,601,1049,1071]" pageId="2" pageNumber="557">
<taxonomicName id="4C0A6090FFB94345FF0AAE32FE36595F" ID-CoL="7Q432" authority="Bousfield, 1984" authorityName="Bousfield" authorityYear="1984" box="[151,457,1049,1071]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="557" phylum="Arthropoda" rank="genus">
<emphasis id="B97EC701FFB94345FF0AAE32FEE0595F" box="[151,287,1049,1071]" italics="true" pageId="2" pageNumber="557">Tethorchestia</emphasis>
<bibRefCitation id="EF9B66E2FFB94345FEB8AE32FE36595F" author="Bousfield" box="[293,457,1049,1071]" pageId="2" pageNumber="557" refString="Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amhpipoda: Talitridae) of the Indo-Pacific region. In: Radovsky, F. J., Raven, P. H. &amp; Somer, S. H. (Eds.), Proceedings of the Symposium on Biogeography of the Tropical Pacific. Bishop Museum Special Publications, 72, pp. 171 - 210." type="journal article" year="1984">Bousfield, 1984</bibRefCitation>
</taxonomicName>
, pp. 204205.
</paragraph>
</subSubSection>
<subSubSection id="C3104898FFB94345FF0AAE77FDEF59CD" pageId="2" pageNumber="557" type="materials_examined">
<paragraph id="8BB51B13FFB94345FF0AAE77FCF45904" blockId="2.[151,1437,1116,2005]" box="[151,779,1116,1141]" pageId="2" pageNumber="557">
<emphasis id="B97EC701FFB94345FF0AAE77FECD5905" bold="true" box="[151,306,1116,1141]" pageId="2" pageNumber="557">
<typeStatus id="54B1A5B1FFB94345FF0AAE77FF2D5905" box="[151,210,1116,1141]" pageId="2" pageNumber="557">Type</typeStatus>
species.
</emphasis>
<taxonomicName id="4C0A6090FFB94345FEA4AE77FCF85904" authority="Bousfield, 1984" authorityName="Bousfield" authorityYear="1984" box="[313,775,1116,1141]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="557" phylum="Arthropoda" rank="species" species="antillensis">
<emphasis id="B97EC701FFB94345FEA4AE77FDB65905" box="[313,585,1116,1141]" italics="true" pageId="2" pageNumber="557">Tethorchestia antillensis</emphasis>
<bibRefCitation id="EF9B66E2FFB94345FDCDAE77FCF85904" author="Bousfield" box="[592,775,1116,1141]" pageId="2" pageNumber="557" refString="Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amhpipoda: Talitridae) of the Indo-Pacific region. In: Radovsky, F. J., Raven, P. H. &amp; Somer, S. H. (Eds.), Proceedings of the Symposium on Biogeography of the Tropical Pacific. Bishop Museum Special Publications, 72, pp. 171 - 210." type="journal article" year="1984">Bousfield, 1984</bibRefCitation>
</taxonomicName>
.
</paragraph>
<paragraph id="8BB51B13FFB94345FF5AAE54FDEF59CD" blockId="2.[151,1437,1116,2005]" pageId="2" pageNumber="557">
<emphasis id="B97EC701FFB94345FF5AAE54FE4A59E8" bold="true" box="[199,437,1151,1176]" pageId="2" pageNumber="557">Component species.</emphasis>
<taxonomicName id="4C0A6090FFB94345FE20AEAAFCF159E8" authority="Bousfield, 1984" authorityName="Bousfield" authorityYear="1984" box="[445,782,1151,1176]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="557" phylum="Arthropoda" rank="species" species="antillensis">
<emphasis id="B97EC701FFB94345FE20AEAAFDB259E8" box="[445,589,1151,1176]" italics="true" pageId="2" pageNumber="557">T. antillensis</emphasis>
<bibRefCitation id="EF9B66E2FFB94345FDCBAE54FCF159E8" author="Bousfield" box="[598,782,1151,1176]" pageId="2" pageNumber="557" refString="Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amhpipoda: Talitridae) of the Indo-Pacific region. In: Radovsky, F. J., Raven, P. H. &amp; Somer, S. H. (Eds.), Proceedings of the Symposium on Biogeography of the Tropical Pacific. Bishop Museum Special Publications, 72, pp. 171 - 210." type="journal article" year="1984">Bousfield, 1984</bibRefCitation>
</taxonomicName>
;
<taxonomicName id="4C0A6090FFB94345FC86AEAAFBAA59E8" authority="Ciavatti, 1989" authorityName="Ciavatti" authorityYear="1989" box="[795,1109,1151,1176]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="557" phylum="Arthropoda" rank="species" species="karukerae">
<emphasis id="B97EC701FFB94345FC86AEAAFC5659E8" box="[795,937,1151,1176]" italics="true" pageId="2" pageNumber="557">T. karukerae</emphasis>
<bibRefCitation id="EF9B66E2FFB94345FC2FAE54FBAA59E8" author="Ciavatti" box="[946,1109,1151,1176]" pageId="2" pageNumber="557" refString="Ciavatti, G. (1989) Les talitres (Crustacea: Amphipoda) des plages de la Guadaloupe. Description de deux especes nouvelles. Annales de l'Institut Oceanographique, Paris, 65 (2), 127 - 146." type="journal article" year="1989">Ciavatti, 1989</bibRefCitation>
</taxonomicName>
;
<taxonomicName id="4C0A6090FFB94345FBFEAEAAFEBD59CD" authority="Bousfield &amp; Poinar, 1995" authorityName="Bousfield &amp; Poinar" authorityYear="1995" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="557" phylum="Arthropoda" rank="species" species="palaeorchestes">
<emphasis id="B97EC701FFB94345FBFEAEAAFAD859E8" box="[1123,1319,1151,1176]" italics="true" pageId="2" pageNumber="557">T. palaeorchestes</emphasis>
<bibRefCitation id="EF9B66E2FFB94345FAB2AE54FEBD59CD" author="Bousfield" pageId="2" pageNumber="557" refString="Bousfield, E. L. &amp; Poinar, G. O. (1995) New terrestrial amphipod from Tertiary amber deposits of the Dominican Republic. Journal of Crustacean Biology, 15, 746 - 755. http: // dx. doi. org / 10.2307 / 1548823" type="journal article" year="1995">Bousfield &amp; Poinar, 1995</bibRefCitation>
</taxonomicName>
(fossil, in amber).
</paragraph>
</subSubSection>
<subSubSection id="C3104898FFB94345FF5AAEECFE105AFD" pageId="2" pageNumber="557" type="diagnosis">
<paragraph id="8BB51B13FFB94345FF5AAEECFE105AFD" blockId="2.[151,1437,1116,2005]" pageId="2" pageNumber="557">
<emphasis id="B97EC701FFB94345FF5AAEECFEBE5990" bold="true" box="[199,321,1223,1248]" pageId="2" pageNumber="557">Diagnosis.</emphasis>
(modified from
<bibRefCitation id="EF9B66E2FFB94345FE66AEECFD555990" author="Bousfield" box="[507,682,1223,1248]" pageId="2" pageNumber="557" refString="Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amhpipoda: Talitridae) of the Indo-Pacific region. In: Radovsky, F. J., Raven, P. H. &amp; Somer, S. H. (Eds.), Proceedings of the Symposium on Biogeography of the Tropical Pacific. Bishop Museum Special Publications, 72, pp. 171 - 210." type="journal article" year="1984">Bousfield 1984</bibRefCitation>
;
<bibRefCitation id="EF9B66E2FFB94345FD2BAEECFC1A5990" author="Bousfield" box="[694,997,1223,1248]" pageId="2" pageNumber="557" refString="Bousfield, E. L. &amp; Poinar, G. O. (1995) New terrestrial amphipod from Tertiary amber deposits of the Dominican Republic. Journal of Crustacean Biology, 15, 746 - 755. http: // dx. doi. org / 10.2307 / 1548823" type="journal article" year="1995">Bousfield and Poinar 1995</bibRefCitation>
; and LeCroy 2011). Eyes large, greater than one third head length; antenna 1, approximately one half length of antenna 2 peduncle,
<emphasis id="B97EC701FFB94345FB5BAEC7FE355858" bold="true" pageId="2" pageNumber="557">extending slightly beyond peduncle article 4</emphasis>
; antenna 2 not sexually dimorphic, that of male slender, not incrassate, without ventral plate on peduncle article 3; upper lip without robust setae; mandible, left lacinia mobilis 45 dentate; maxilliped, palp 4-articulate, article 2 with well-developed medial lobe, article 4 reduced; gnathopod 1 of male subchelate, palm well-developed, transverse, longer than dactyl; carpus and propodus, posterior margin with rounded lobe covered with palmate setae; gnathopod 1 of female parachelate, palm poorly developed, shorter than dactyl; gnathopod 2 of male subchelate, basis stout, without tubercles on anterior margin, merus and carpus free, unfused, dactyl distally attenuate, extending two thirds length of propodus, without tooth on cutting edge;
<emphasis id="B97EC701FFB94345FB7BAFCCFD395B38" bold="true" pageId="2" pageNumber="557">gnathopod 2 of female, oostegite strap-like, with 1927 long, simple marginal setae, basis inverted pyriform, expanded proximally, anterior margin narrowing distally</emphasis>
; peraeopods 37 cuspidactylate; peraeopods 57 without slender setae lining anterior margin of dactyl; peraeopod 7 weakly sexually dimorphic, merus and carpus of male not or very weakly incrassate,
<emphasis id="B97EC701FFB94345FE2AAC5CFDED5BC5" bold="true" pageId="2" pageNumber="557">propodus of male with 56 tufts of long, stiff, slightly medial slender setae on anterodistal and distal margins</emphasis>
; pleon segments 13 without dorsal spines; epimera 13 without vertical slits; pleopods 13 slightly reduced, peduncles slender; uropods 12, rami without apical spade-like robust setae; uropod 1 not sexually dimorphic,
<emphasis id="B97EC701FFB94345FE5CACCFFB585B8D" bold="true" box="[449,1191,1764,1789]" pageId="2" pageNumber="557">peduncle with well-developed dorsolateral robust seta distally</emphasis>
, outer ramus slender, without marginal robust setae; uropod 2, outer ramus subequal to inner in length; uropod 3 well-developed, ramus shorter than peduncle, at least twice as long as deep, cylindrical, not laterally compressed, tapering distally, tip subacute; telson apically notched, with 311 robust setae per lobe, distinctly shorter than uropod 3, not extending beyond distal end of peduncle.
</paragraph>
</subSubSection>
<subSubSection id="C3104898FFB94344FF5AADB3FAD85F4D" lastPageId="3" lastPageNumber="558" pageId="2" pageNumber="557" type="discussion">
<paragraph id="8BB51B13FFB94344FF5AADB3FAD85F4D" blockId="2.[151,1437,1116,2005]" lastBlockId="3.[151,1437,151,573]" lastPageId="3" lastPageNumber="558" pageId="2" pageNumber="557">
<emphasis id="B97EC701FFB94345FF5AADB3FEC45AC1" bold="true" box="[199,315,1944,1969]" pageId="2" pageNumber="557">Remarks.</emphasis>
<bibRefCitation id="EF9B66E2FFB94345FED9ADB3FDFB5AC0" author="Bousfield" box="[324,516,1944,1969]" pageId="2" pageNumber="557" refString="Bousfield, E. L. (1982) Amphipoda: Gammaridea. In: Parker, S. P. (Ed.), Synopsis and Classification of Living Organisms. Vol. 2. McGraw-Hill, New York, pp. 254 - 285." type="book" year="1982">Bousfield (1982)</bibRefCitation>
first established the use of the number of teeth in the lacinia mobilis of the left mandible as a generic level diagnostic character within the family
<taxonomicName id="4C0A6090FFB94345FC17AD97FC075AA5" box="[906,1016,1980,2005]" class="Malacostraca" family="Talitridae" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="557" phylum="Arthropoda" rank="family">Talitridae</taxonomicName>
, defining talitrids as 46-dentate and dividing the family into several groups, based in part upon the dentition of the left lacinia. Later,
<bibRefCitation id="EF9B66E2FFB84344FB4AAABCFA685DC0" author="Bousfield" box="[1239,1431,151,176]" pageId="3" pageNumber="558" refString="Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amhpipoda: Talitridae) of the Indo-Pacific region. In: Radovsky, F. J., Raven, P. H. &amp; Somer, S. H. (Eds.), Proceedings of the Symposium on Biogeography of the Tropical Pacific. Bishop Museum Special Publications, 72, pp. 171 - 210." type="journal article" year="1984">Bousfield (1984)</bibRefCitation>
, in his diagnosis of the genus
<taxonomicName id="4C0A6090FFB84344FE42AA97FD8A5DA5" box="[479,629,188,213]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="3" pageNumber="558" phylum="Arthropoda" rank="genus">
<emphasis id="B97EC701FFB84344FE42AA97FD8A5DA5" box="[479,629,188,213]" italics="true" pageId="3" pageNumber="558">Tethorchestia</emphasis>
</taxonomicName>
, stated that the left mandible has a 4-dentate lacinia mobilis and placed it within the 4-dentate cuspidactylate beachflea group. However,
<bibRefCitation id="EF9B66E2FFB84344FC3AAAF4FB065D88" author="Bousfield" box="[935,1273,223,248]" pageId="3" pageNumber="558" refString="Bousfield, E. L. &amp; Poinar, G. O. (1995) New terrestrial amphipod from Tertiary amber deposits of the Dominican Republic. Journal of Crustacean Biology, 15, 746 - 755. http: // dx. doi. org / 10.2307 / 1548823" type="journal article" year="1995">Bousfield and Poinar (1995)</bibRefCitation>
modified the diagnosis of the genus to indicate that the left lacinia mobilis is &quot;basically 4-dentate&quot;. This latter statement is somewhat open to interpretation and could be said to apply to the variably 45-dentate condition found in both
<taxonomicName id="4C0A6090FFB84344FF0AAB67FED25C15" box="[151,301,332,357]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="3" pageNumber="558" phylum="Arthropoda" rank="genus">
<emphasis id="B97EC701FFB84344FF0AAB67FED25C15" box="[151,301,332,357]" italics="true" pageId="3" pageNumber="558">Tethorchestia</emphasis>
</taxonomicName>
and
<taxonomicName id="4C0A6090FFB84344FEF5AB67FE005C15" box="[360,511,332,357]" class="Malacostraca" family="Talitridae" genus="Mexorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="3" pageNumber="558" phylum="Arthropoda" rank="genus" status="gen. nov.">
<emphasis id="B97EC701FFB84344FEF5AB67FE005C15" box="[360,511,332,357]" italics="true" pageId="3" pageNumber="558">Mexorchestia</emphasis>
</taxonomicName>
<taxonomicNameLabel id="A24D7A7AFFB84344FD94AB67FDA55C15" box="[521,602,332,357]" pageId="3" pageNumber="558" rank="genus">
<emphasis id="B97EC701FFB84344FD94AB67FDA55C15" bold="true" box="[521,602,332,357]" pageId="3" pageNumber="558">n. gen.</emphasis>
</taxonomicNameLabel>
(Figs. 2, 10;
<bibRefCitation id="EF9B66E2FFB84344FD64AB67FC6A5C14" author="Ciavatti" box="[761,917,332,357]" pageId="3" pageNumber="558" refString="Ciavatti, G. (1989) Les talitres (Crustacea: Amphipoda) des plages de la Guadaloupe. Description de deux especes nouvelles. Annales de l'Institut Oceanographique, Paris, 65 (2), 127 - 146." type="journal article" year="1989">Ciavatti 1989</bibRefCitation>
, Figs. 13, 17). In both genera, the fifth tooth ranges in development from a virtually indistinguishable bump to a distinct, reasonably well-developed tooth and this variation does not seem to be the result of sexual dimorphism or developmental changes. A single species in the Australian genus
<taxonomicName id="4C0A6090FFB84344FE01AB9CFCA65CA0" authority="Serejo and Lowry 2008" authorityName="Serejo and Lowry" authorityYear="2008" box="[412,857,439,464]" class="Malacostraca" family="Talitridae" genus="Notorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="3" pageNumber="558" phylum="Arthropoda" rank="genus">
<emphasis id="B97EC701FFB84344FE01AB9CFDD35CA0" box="[412,556,439,464]" italics="true" pageId="3" pageNumber="558">Notorchestia</emphasis>
<bibRefCitation id="EF9B66E2FFB84344FDA7AB9CFCA65CA0" author="Serejo" box="[570,857,439,464]" pageId="3" pageNumber="558" refString="Serejo, C. S. &amp; Lowry, J. K. (2008) The coastal Talitridae (Amphipoda: Talitroidea) of southern and western Australia, with comments on Platorchestia platensis (Kroyer, 1845). Records of the Australian Museum, 60, 161 - 206. http: // dx. doi. org / 10.3853 / j. 0067 - 1975.60.2008.1491" type="journal article" year="2008">Serejo and Lowry 2008</bibRefCitation>
</taxonomicName>
(
<taxonomicName id="4C0A6090FFB84344FCECAB92FC035CA0" box="[881,1020,439,464]" class="Malacostraca" family="Talitridae" genus="Notorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="3" pageNumber="558" phylum="Arthropoda" rank="species" species="australis">
<emphasis id="B97EC701FFB84344FCECAB92FC035CA0" box="[881,1020,439,464]" italics="true" pageId="3" pageNumber="558">N. australis</emphasis>
</taxonomicName>
), also a member of the 4-dentate cuspidactylate beachflea group, has a 45 dentate lacinia mobilis as well, and it thus appears that there is occasionally some intraspecific variability in this character within the group. We have modified the generic diagnosis of
<taxonomicName id="4C0A6090FFB84344FEBBA80FFE425F4D" box="[294,445,548,573]" class="Malacostraca" family="Talitridae" genus="Tethorchestia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="3" pageNumber="558" phylum="Arthropoda" rank="genus">
<emphasis id="B97EC701FFB84344FEBBA80FFE425F4D" box="[294,445,548,573]" italics="true" pageId="3" pageNumber="558">Tethorchestia</emphasis>
</taxonomicName>
to reflect this variability in lacinia mobilis dentition in members of the genus.
</paragraph>
</subSubSection>
</treatment>
</document>